PrepTest 65, Section 2, Question 19
Last winter was mild enough to allow most bird species to forage naturally, which explains why the proportion of birds visiting feeders was much lower than usual. The mild winter also allowed many species to stay in their summer range all winter without migrating south, thereby limiting the usual attrition accompanying migration. Hence, last year's mild winter is responsible for this year's larger-than-usual bird population.
Last winter was mild enough to allow most bird species to forage naturally, which explains why the proportion of birds visiting feeders was much lower than usual. The mild winter also allowed many species to stay in their summer range all winter without migrating south, thereby limiting the usual attrition accompanying migration. Hence, last year's mild winter is responsible for this year's larger-than-usual bird population.
Last winter was mild enough to allow most bird species to forage naturally, which explains why the proportion of birds visiting feeders was much lower than usual. The mild winter also allowed many species to stay in their summer range all winter without migrating south, thereby limiting the usual attrition accompanying migration. Hence, last year's mild winter is responsible for this year's larger-than-usual bird population.
Last winter was mild enough to allow most bird species to forage naturally, which explains why the proportion of birds visiting feeders was much lower than usual. The mild winter also allowed many species to stay in their summer range all winter without migrating south, thereby limiting the usual attrition accompanying migration. Hence, last year's mild winter is responsible for this year's larger-than-usual bird population.
Which one of the following, if true, would most strengthen the reasoning in the argument?
Increases in bird populations sometimes occur following unusual weather patterns.
When birds do not migrate south, the mating behaviors they exhibit differ from those they exhibit when they do migrate.
Birds eating at feeders are more vulnerable to predators than are birds foraging naturally.
Birds that remain in their summer range all winter often exhaust that range's food supply before spring.
Birds sometimes visit feeders even when they are able to find sufficient food for survival by foraging naturally.
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